Compound locomotive



No. 6l7,238.

Patented Jan. 3, I899. 8. H. DUNNING. COMPOUND, LOGOMOTIVE.

(A pplication filed May 28, 1898.)

2 Sheets--Sheet l.

QNn Model.)

WITNESSES: 3

ATTORNEYS.

Tu: Nona lrrE SAMUEL n. DUNNING, or PATERSON, NEW JERSEY.

COMPOUND LOCOMOTIVE.

SPECIFICATION formin part of Letters Patent No. 617,238, dated January 3, 1899. Application filed 28, 1898. Serial No. 681,973. (No model.)

To aZZ whom, it may concern.-

Be it known that I, SAMUEL H. DUNNING, a citizen of the United States, residing in Paterson, county of Passaic, and State of New Jersey, have invented certain new and useful Improvements in Compound Locomotives; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and numerals of reference marked thereon, which form a part of this specification.

This invention relates to improvements in compound locomotives; and its object is to simplify the construction of the same by doing away with heavy overhanging parts and castings; furthermore, to shift the weight of the driving-wheel-operating mechanism as.

close as possible to the said driving-wheels to thus increase the adhesion of the latter to the rails, and, finally, to permit a quick and ready I adjustment and repairing of the various parts constituting the driving Wheel operating mechanism.

The invention consists in the improved compound locomotive, in the arrangement of the low and high pressure cylinders on said locomotive, and in the combination and arrangement of the various parts thereof, substantially as will be hereinafter more fully described, and finally embodied in the clauses of the claim.

Referring to the accompanying drawings, in which like letters and numerals of reference indicate corresponding parts in each of the several views, Figure 1 is a side elevation, partly in section, of the front portion of my improved compound locomotive, only those parts being shown which are necessary to fully illustrate the nature of my said invention; Fig. 2, a top plan view illustrating the position and arrangement of the high and low pressure cylinders and their respective steam-chests and also showing in section the various steam passages and exhausts communicating with said steam-chests; Fig. 3, a sectional view on the line a; 00 of Fig. 2, showing in addition in section the boiler and the steam or drive pipe encircling the same and connected with the respective steam-passages leading to the steam-chests of the high-pressure cylinders; and Fig. 4, an end elevation, partly in section, of the cross-head and guides for the latter, as will be hereinafter more fully described.

In said drawings, or represents an ordinary truck supporting the frame I) in the usual and well-known manner.

On each side of and below the boiler c are arranged the high and low pressure cylinders d e and f g, respectively. The low-pressure cylinders are placed approximately above the central portion of the truck a, while the highpressure cylinders are placed in rear of their respective low-pressure cylinders and in close proximity to the driving-wheels h. In connection with the above it must be stated that the center line of the high-pressure cylinder is parallel with, yet above, the center line of its respective low-pressure cylinder, so as to clear the connecting-rod 2' during its travel or oscillation. The inner portion of each rod 4 is connected with its respective driving- Wheel (and axle therefor) in the usual and well-known manner, while its forward end is pivotally connected, as at m, to a downwardlyprojecting portion a of the cross-head o,'which latter is slidingly arranged between the guides 0', 0 and 0 Said guides are securely connected to the inner cylinder-heads of the high and low pressure cylinders, as clearly illustrated in Figs. 1 and 2 of the drawings.

Removably secured to the cross-head. 0 is a piston-rod 19 for the piston 19 of the highpressure cylinder and also the two pistonrods 19 19 of the piston 19 of the low-pressure v e g and d f, respectively, and control the various ports and passages in a manner hereinafter described.

The link g is provided in its central portion with an elongated vertical slot, in which is slidingly arranged a pin projecting from the oscillating lever r, mounted on the rocking shaft r and connected with the axle of the driving-Wheels by rod and eccentrics in the usual manner, and as not forming 'a part of the present invention the said rods and eccentrics are not illustrated in the drawings.

The drive-pipe 2, receiving its steam from k the live-steam pipe 18 in the usual manner,

communicates through passages 3 and 4, arranged in the saddle 5, with the steam-chests of the high-pressure cylinders e and d, each of which is connected with its respective steam-chest by ports or channels 6 and 7 arranged on opposite sides of the exhaust 8. Said exhaust communicates through the receiver 9 with the channels or ports 10 and 11 in saddle 1?, leading to the steam-chest of the low-pressure cylinder, which is likewise connected with its respective steam chest by ports or channels 12 and 13, arranged at opposite sides of the exhaust 14, the latter communicating with the atmosphere through the main exhaust 15.

In operation when steam is admitted through the drive-pipe 2 and ports and channels 3 and 4 into the steam-chest the steam enters through ports 6 into the rear portion of the high-pressure cylinder (1 and forces the piston 19 forward. The steam contained in the front portion of the high-pressure cylinder exhausts through port 7 and exhaust 8 into the receiver 9 and passes from there through the channels 10 and 11 into the steamchest of the lowpressure cylinder f. From the last-mentioned steam-chest the steam enters through port 13 into the rear portion of the said low-pressure cylinder f and forces its piston 13 forward.- The steam contained in the front portion of the low-pressure cylinder during that operation exhausts through port 12, exhaust 14, and through the main exhaust 15 to the atmosphere. IVhen the pistons 17 and 19 have reached their extreme forward positions, the connecting-link g is operated or shifted in the usual and well-known manner, thereby throwing the slide-valves, allowing the steam to enter through port 7 into the front portion of the high-pressure cylinder d, and the exhaust-steam from said high-pressure cylinder through the port 12 into the front portion of the low-pressure cylinder f, as will be manifest.

It must be remarked that the pistons in the high and low pressure cylinders e and g are operated in precisely the same manner.

From the foregoing it can be seen that by arranging the high-pressure cylinder in rear of the low-pressure cylinder and in close proxs imity to its respective driving-wheel the weight of the driving-wheel-operating mechanism is shifted rearward, and accordingly the adhesion between the driving-wheels and the rails is considerably increased. Furthermore, whenever it is required to adjust or repair any part of the said driving mechanism, and especially the pistons of the high and low pressure cylinders, the same can be easily and quickly accomplished by simply removing the respective outer cylinder-heads without the necessity of interfering with the remaining parts of the said driving mechanism, which is a great objection to the present construction of compound locomotives.

I do not intend to limit myself to the pre cise construction as shown and described, as various alterations can be made without changing the scope of my invention but;

What I claim as new, and desire to secure by Letters Patent, is:-

1. In a compound locomotive, the combi nation with the low and high pressure cylin ders arranged tandem and with their respective steam-chests, the low-pressure cylinders being placed at or near the front portion of the engine and the high-pressure cylinders being placed in rear of the low-pressure cylinders and in close proximity to the driving- Wheel, the center lines of the former being parallel with and above the center lines of said low-pressure cylinders, of pistons in said cylinders, driving wheel operating crossheads slidingly arranged between said high and low pressure cylinders, a piston-rod connecting the piston of each high-pressure cylinder with the corresponding cross-head, upper and lower piston-rods connecting the piston of each low-pressure cylinder with said crosshead, the upper one being in alinement with the piston-rod of said high-pressure cyl inder, steam passages, portsand exhausts communicating with the steam-chests of said cylinder, and slide-valves in said steam-chests controlling said passages, ports and exhausts, substantially as and for the purpose described. I

2. In a compound locomotive, the combi nation with the low and high pressure cylinders arranged tandem and with their respective steam-chests, the low-pressure cylinder being placed at or near the front portion of the engine, while the high-pressure cylinder is placed in rear of the low-pressure cylinder and in close proximity to the driving-wheel, its center line being parallel with and above the center line of the said low-pressure cylinder, of pistons in said cylinders, the driv= ing-wheel-operating cross-head slidingly arranged between the cylinders, a piston-rod connecting the piston of the high-pressure cylinder with said cross-head, two piston-rods connecting the piston of the low-pressure cylinder with said cross-head, ports connecting the front and rear portion of each cylinder with its respective steam-chest, an exhaust between the ports in the high-pressure cylinder and communicating with the steam-chest of the 10W=press11re cylinder, an exhaust be- In testimony that i claim the foregoing I tween the ports in said low-pressure cylinder have hereunto set my hand this 20th day of IO and communicating with the atmosphere, live- May, 1898. steam passages leading to the steam-chest of the high-pressure cylinder, and slide-Valves SAMUEL DUNNING' in the said steam-chests controlling said ports, Witnesses: passages and exhausts, substantially as set ALFRED GARTNER, forth. JAMES B. NEWTON. 

